sdbusplus: use shorter type aliases

The sdbusplus headers provide shortened aliases for many types.
Switch to using them to provide better code clarity and shorter
lines.  Possible replacements are for:
  * bus_t
  * exception_t
  * manager_t
  * match_t
  * message_t
  * object_t
  * slot_t

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I9bb7b9a430d029ddaf2a08ea26acb775b9b2b152
diff --git a/csr.cpp b/csr.cpp
index 5b44c62..5caed9d 100644
--- a/csr.cpp
+++ b/csr.cpp
@@ -31,7 +31,7 @@
 using X509ReqPtr = std::unique_ptr<X509_REQ, decltype(&::X509_REQ_free)>;
 using BIOPtr = std::unique_ptr<BIO, decltype(&::BIO_free_all)>;
 
-CSR::CSR(sdbusplus::bus::bus& bus, const char* path, std::string&& installPath,
+CSR::CSR(sdbusplus::bus_t& bus, const char* path, std::string&& installPath,
          const Status& status) :
     internal::CSRInterface(bus, path,
                            internal::CSRInterface::action::defer_emit),